# Lightmass crashed

**URL:** <https://forums.unrealengine.com/t/lightmass-crashed/281214>\
**Category:** Rendering\
**Tags:** Lightmass, ram, unreal-engine, crash, bug-report, question\
**Created:** [April 21, 2014, 2:52pm UTC](https://forums.unrealengine.com/t/lightmass-crashed/281214 "2014-04-21T14:52:10Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![Tim\_Hobson](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@Tim\_Hobson](https://forums.unrealengine.com/u/Tim_Hobson)\
**Post date:** [November 4, 2015, 2:43pm UTC](https://forums.unrealengine.com/t/lightmass-crashed/281214/5 "2015-11-04T14:43:14Z")

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Hi Tech1187,

Have a look at the Swarm Agent/Lightmass Troubleshooting guide. Try the suggestions to resolve the issue. Also, only use Power of 2 (2, 4, 8, 16, 32, etc) lightmap resolutions.

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